[ncl-talk] how to replace missing value

[Kevin Hallock]

Hi Ning,

NCL’s where() <https://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml> and ismissing() <https://www.ncl.ucar.edu/Document/Functions/Built-in/ismissing.shtml> functions should be helpful for this task.

Here’s an example of how you could replace missing values in Y with values from the corresponding index in X:
y = where(.not.ismissing(y), y, x)

This could also be written as:
y = where(ismissing(y), x, y)

I hope this helps,
Kevin

> On Apr 18, 2018, at 7:38 AM, ma.n2007 <ma.n2007 at aliyun.com> wrote:
> 
> Hi Sir,
> Imagin that I have two data X and Y, both are with (tim, lat, lon).
> If some grids of Y has missing values, while X does not. How can I replace the missing values in Y with the X grid value? This could fill the Y.
> Could you please help me? 
> 
> Thanks
> Ning
> 
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